Chavdar Dutsov

Chavdar Dutsov

PostDoctoral Fellow at Paul Scherrer Institute

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A list of all the posts and pages found on the site. For you robots out there is an XML version available for digesting as well.

Pages

Posts

Animated 3D plot in spherical coordinates with gnuplot

4 minute read

Published:

I am working on a physics experiment that involves muons that are stored in a magnetic field and are traveling along circular orbits. Their motion inside the magnetic field is quite complex and involves oscillations with different periods – essentially they are like a spinning top, but instead of precessing around only one axis, they can precess around three. Read more

Making a 25ps resolution Time-to-Digital converter on an Artix-7 FPGA

1 minute read

Published:

I want to share a small project I did in which a 25 ps Time-to-Digital converter is implemented in an Artix-7 FPGA. The goal was to be able to measure tiny intervals between singals from two photomultiplier tubes. Finally, a fast digitizer was better suited for the job, but nevertheless the TDC works well and could be useful. Read more

Pretty matplotlib pgf figures in Latex documents

4 minute read

Published:

In my experience adding matplotlib figures into Latex documents is not trivial at all, unless you are satisfied with a simple non-vector png. I will try to explain here how to export a figure into pgf, and how to include that in your tex file later. The usual disclamer is valid here: it works on my machine and I can’t guarantee that it will work on yours. As of now, I am using python 3.9 and matplotlib 3.4. After the tutorial you can expect some result as the one shown in the figure below. Read more

art

My first drawing on a tablet

Published:

A drawing of a comet. This was my first drawing on a tablet. It’s not very good, but it got me excited for digital drawings. The drawing was made on a Samsung Galaxy S6 Lite tabled with the S-pen. Read more

Drawing of the Northern Lights

Published:

A drawing of the Northern Lights with mountains and a lake. The drawing was made on a Samsung Galaxy S6 Lite tabled with the S-pen. It’s a very nice device for drawing! Read more

Drawing of Saturn

Published:

A drawing of Saturn and his majestic rings. The drawing was made on the Galaxy Tab S6 Lite with the Sketchbook app. Read more

Drawing of the Eiffel Tower

Published:

Drawing of a scene in Paris where after an autumn rain the Eiffel tower is reflected in a puddle. The drawing was made on the Galaxy Tab S6 Lite with the Sketchbook app. Read more

July Morning

Published:

A drawing of a fantastical July morning at the Black Sea. The drawing was made on the Galaxy Tab S6 Lite with the Sketchbook app. It was heavily inspired by a drawing I saw on the PenUp app by this author. Read more

Drawing of Jupiter and Io

Published:

A drawing of Jupiter and its moon Io seen when the Juno spacecraft approaches them. Europa can be seen in the distance, casting its shadow over the gas giant. The drawing was made on the Galaxy Tab S6 Lite with the Sketchbook app. Read more

Drawing of Neptune seen from Triton

Published:

A drawing of Neptune as seen from its moon Triton. Some natural phenomena specific to Triton are visible - liquid nitrogen geysers and lakes. Triton has a very thin atmosphere, but it should form nitrogen mist near the surface. Triton’s surface is new as it has tectonic activity, but there might be a few craters here and there, as the one seen on the drawing. Read more

Red moon rising

Published:

A drawing of a blood red moon over a sand dune. I drew it in anticpation of the new Dune movie. Inspired by the style of this artist. Read more

The Pleiades

Published:

Drawing of the Pleiades visible in a drop of water fallen on a leaf. Read more

Messier Thirty-One

Published:

Drawing of the Andromeda galaxy. It was supposed to be part of a more complex picture, but I liked it the way it is. Read more

The Prophecy

Published:

Here I wanted to experiment with something different. I drew a ‘normal’ picture using the Sketchbook app. Then I used GIMP to add a different character to it. First I used the ‘Sobel’ edge detection algorithm and then I applied some method that clusters the colors in the image. You can see below the end result and after that the original image. Read more

publications

Design and Field Tests of Scintillation Spectrometer for Continuous Radon in Soil-gas Monitoring

, In the proceedings of 2018 IEEE Nuclear Science Symposium and Medical Imaging Conference Proceedings (NSS/MIC), 2018

Use Google Scholar for full citation Read more

Recommended citation: Krasimir Mitev, Chavdar Dutsov, Ludmil Tsankov, Strahil Georgiev, Mityo Mitev, Nikolay Markov, Todor Todorov, "Design and Field Tests of Scintillation Spectrometer for Continuous Radon in Soil-gas Monitoring." In the proceedings of 2018 IEEE Nuclear Science Symposium and Medical Imaging Conference Proceedings (NSS/MIC), 2018.

In quest of the optimal coincidence resolving time in TDCR LSC Permalink

Ch. Dutsov, Ph. Cassette, K. Mitev, B. Sabot, Nucl. Instrum. Meth. A, 2021

This paper presents studies of the influence of the coincidence resolving time on the activity calculated by the Triple-to-Double Coincidences Ratio (TDCR) method in Liquid Scintillation (LS) counting. Recently, published methods for the correction for accidental coincidences in TDCR counting open the possibility to use resolving times up to several microseconds, long enough not to miss true coincidences and to study the effects of delayed fluorescence. Read more

Time-domain based evaluation of detection efficiency in liquid scintillation counting Permalink

K. Mitev, Ch. Dutsov, Ph. Cassette, B. Sabot, Scientific Reports, 2021

This work explores the distribution of time intervals between signals from the photomultiplier tubes (PMTs) of a liquid scintillation counting (LSC) system when a scintillation burst caused by an ionizing particle is detected. This distribution is termed the cross-correlation distribution and it is shown that it contains information about the probability to detect a scintillation event. A theoretical model that describes the cross-correlation distribution is derived. The model can be used to estimate the mean number of detected photons in a LSC measurement, which allows the calculation of the detection efficiency. The theoretical findings are validated by Monte Carlo simulations and by experiments with dedicated LSC systems and several commercial LSC cocktails. The results show that some of the parameters of the cross-correlation distribution such as the peak height or the kurtosis can be used as detection efficiency estimators or quenching indicators in LSC. Thus, although the time domain and the cross-correlation distribution have received little to no attention in the practice of LSC, they have the capacity to bring significant improvements in almost all LSC applications related to activity determination. The results also suggest concepts for Read more

software

talks